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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractTripleEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.SubstringExpression
public final class SubstringExpression
The second and third arguments of the SUBSTRING function denote the starting position and length of the substring to be returned. These arguments are integers. The first position of a string is denoted by 1. The SUBSTRING function returns a string.
JPA 1.0:
SUBSTRING(string_primary, simple_arithmetic_expression, simple_arithmetic_expression)
JPA 2.0:
SUBSTRING(string_primary, simple_arithmetic_expression [, simple_arithmetic_expression])
JPA 2.1:
SUBSTRING(string_expression, arithmetic_expression [, arithmetic_expression])
| Field Summary |
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| Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression |
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COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE |
| Constructor Summary | |
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SubstringExpression(AbstractExpression parent)
Creates a new SubstringExpression. |
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| Method Summary | |
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void |
accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor. |
JPQLQueryBNF |
getQueryBNF()
Returns the BNF of this Expression. |
protected boolean |
isThirdExpressionOptional()
Determines whether the third expression is an optional expression, which means a valid query can have it or not. |
java.lang.String |
parameterExpressionBNF(int index)
Returns the BNF to be used to parse one of the encapsulated expression. |
protected java.lang.String |
parseIdentifier(WordParser wordParser)
Parses the identifier of this expression. |
| Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression |
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addOrderedChildrenTo, areLogicalIdentifiersSupported, getActualIdentifier, getIdentifier, hasLeftParenthesis, hasRightParenthesis, hasSpaceAfterIdentifier, isParsingComplete, parse, shouldParseRightParenthesis, toParsedText |
| Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public SubstringExpression(AbstractExpression parent)
SubstringExpression.
parent - The parent of this expression| Method Detail |
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public void accept(ExpressionVisitor visitor)
Expression by the given visitor.
visitor - The ExpressionVisitor to visit this objectpublic JPQLQueryBNF getQueryBNF()
Expression.
JPQLQueryBNF, which represents the grammar of this Expressionprotected boolean isThirdExpressionOptional()
isThirdExpressionOptional in class AbstractTripleEncapsulatedExpressiontrue if the third expression can either be present or not in a valid
query; false if it's mandatorypublic java.lang.String parameterExpressionBNF(int index)
parameterExpressionBNF in class AbstractTripleEncapsulatedExpressionindex - The position of the encapsulated Expression that needs to be parsed
within the parenthesis, which starts at position 0
protected java.lang.String parseIdentifier(WordParser wordParser)
parseIdentifier in class AbstractEncapsulatedExpression
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